American Heritage® Dictionary of the English Language, Fourth Edition
- n. A gun trigger adjusted to respond to a very slight pressure.
Century Dictionary and Cyclopedia
- n. In a firearm, a secondary trigger controlling a safety locking device which secures the chief trigger, by which the piece is fired. The hair-trigger is so adjusted as to be actuated by a very light pressure, and sets free a spring mechanism called the hair, which strikes the tumbler-catch and throws the sear out of a notch in the tumbler.
GNU Webster's 1913
- n. a trigger so constructed as to discharge a firearm by a very slight pressure, as by the touch of a hair.
- n. a gun trigger that responds with little pressure
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